Diaphragm.



No. 874,517. y PATENTED7DEC.-24. 1907 *GB. LOWRY.

DIAPHRAGM.

APPLICATION FILED JUNE 2,1906.

o ov l' o '[111'. 0 oooooooo oooo I UNITED STATES PATENT; ormonijcUTHBERrBSLoWRY; orl.iii-ir.'riwiiroitjKairrUoKY.Y

Be it known that L-CUTHBETAB. Low'mr,E of-Lexington, inthe countyof'Fayette and' State ofl Kentucky, have invented certain new and usefulImprovements in Diat or boiler acting outwardly on the diaphragmphragms; and l do hereby declare -the 'folf lowing to be a full, clear,and exact description of the invention, such as wi enable others skilledin the art to which .it apper tains to make and use the same.

.In tanks, retorts, boilers and the' like equipped. withpressure'indic'ators, more or less difficulty has heretofore beenexperienced in connection with the pressure diaphragme which arelalternately subjected to internal pressures and `vacua, as forinstancelin wood A impregnating wherein the retortsare first chargedwith creo'soting compounds under pressure, and then subjected to avacuum or effecting the removal of the surplus oil.

The object of my invention is toprovide a Vdiaphragm which whilesensitive to vpressure, yet will not break or be damagedwhen' reverselyacted upon 'by the formation of a "claims.

vacuum.

The' invention will be hereinafter fully set forth and particularlypointed outl in the In the accompanying drawings, Figure 1 -is'asideele'vation showing therelative 1oca.l tion of the diaphragm to theindicator and 'a retort. Fig. 2' is `a vertical -sectional View throughthe diaphragm., Fig. 3 lis aview of lthe diaphragm removed, and'F ig. 4`is a similar view ofthe stop plate.

Referringfto'th drawings, l designates the casingy which is preferablycomposedof two corresponding plates of fconcavo-convex formation unitedby nutted bolts 2 assed through the perforated,- flanges -t ereof.

One of these plates is formed with a central opposite concavo faceslofthe two plates,

. such plate being held at its edge between the flanges of the casingplates, and for this purpose'it is formed with perforations toaccommodate bolts 2." .Preferably this diaphragm is formed ofthin'tempered brass, which best adapted yfor the purpose, although, if

y'llhe'l'space between the diaphragm and thev desired, 'it maybe madefrom other material.

` if @indie-aards fallacy-.61nd with ,geraamte other' fluid', "which 'is.ordinarily through the -valvedeconiiection 9 opening .into a horizontalportion of pipe y6. It is 'manifest that the pressures within theretort' kets l2 around the edgeof the diaphragmr f and between the edgesof the casing plates. This plate is formed with numerous holes orperforations 13 to permit of pressure acting directly upon lthediaphragm. The function of this plate, however, is to prevent any. unduestrain or tension upon the diaphragm when a vacuum .is formed within theretort.

It is manifest that upon the creationof-a vacuum the 'flexible portionof the diaphragm plate will'be drawn inwardly, but by reason of thejuxtaposition of the perforated plate of inflexible material the.movement of the diaphragm will be instantly arrested,

thereby avoiding breakage thereof orinjuryl thereto. l .4 v

It is essential, in connection with theimpregnating of wood withcreosotinr com. pounds, that afmetallic diaphragm e employed, since alnon-metallic diaphragm would be quickly destroyed by the oreoso tingcompound, and heretofore the use of a metallic diaphragm, and inparticular one of tempered brass, has been inipracticable because of theshortnessfof the life thereof consequent upon the alternate creation ofpressuresand vacua.

1. The combination lwith a tank retort, or the like, and an indicator,of a diaphragm casing interposed between said tank or retort and theindicator, a diaphragm within said casing, and a stop plate spaced frombut in close proximity to. the diaphragm for liniiting the inwardmovement of the flexible portion thereof upon the creation of a vacuumwithin such tank or retort, said stop plate having perforations formedtherein.

2. The combination with a tanki retort, or i `the like, and anindicator, of a iaphragm casing interposed between said tank or retort"al' indicator, a .metallic ,diaphragm posed of two correspondingplatesunitede'?- l0 their edges, of a metallic diaphragm 'plate of flexiblemete] held between seid edges, :amdl a.

phi'egm plete.

Eerforeted disk of inflexible metal oleo etween seid edges, said diskbeing infeI-,o relation to, but spaced epajrt Jrom, seid dia,-

-15 .In testimony whereof, 'Illave signed this specification .in thevpresence of two sub- I Scribi'ng Witnesses? CUTHBERT B. LOWRY..Witnesses:

` S. H. FIELDS,

THos. B. TAYLOR.

